It’s very unlikely that the USD will lose its status particularly to the Yuan. You can do that mental calculation yourself. Would you convert all of your lifesavings from USD to Yuans today or in the next 10 years? The answer is probably “not a chance”. The reason is simple, liquidity and trust. China has no comparable open and independent financial institutions international central banks can trust, nor can they have them without surrendering control over their monetary policy. So as long as there’s no alternative to the USD (BRICS will likely fail), it will continue being the default global currency for reserves, debt and trade.